[racket-dev] weirdest bug ever

Hello,

try the following in the interaction panel of DrRacket:

(display (integer->char #x2144))

Or, just put this character in an editor buffer.
The character is displayed 3 lines below its proper position.

AFAIK, this character is a normal ‘Letterlike Symbol’. It shouldn't
have any misterious formatting properties, and it's a character of
fundamental importance for writing  ¡uʍop ǝpısdn    8^)

(latest nightly build, on windows 8)

Puzzled P.

========
#lang racket

(provide upside-down)

(define table
  (let ()
    (define (putin t s1 s2)
      (for/fold ((t t))
        ((c1 (in-string s1))
         (c2 (in-string s2)))
        (hash-set t c1 c2)))
    (for/fold ((t (hash)))
      ((pair (in-list '(("abcdefghijklmnopqrstuvwxyz?!’._()[]{}<>;"
                         "ɐqɔpǝɟƃɥıɾʞןɯuodbɹsʇnʌʍxʎz¿¡,˙‾)(][}{><؛")
                        ("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                         "∀qƆpƎℲפHIſʞ˥WNOԀQɹS┴∩ΛMX⅄Z")
                        ))))
      (putin t (first pair) (second pair)))))

(define (upside-down string)
  (list->string
   (reverse
    (for/list ((c (in-string string)))
      (hash-ref table c c)))))

========